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out of Plumbness Tank

out of Plumbness Tank

out of Plumbness Tank

Dear All:

We have a newly constructed tank which after inspection by third party found out of plumpness in two locations.

1. What is the best way to get the situation corrected.
2. In case owner accepts the tank with current situation, is there any design variable need to be verified or run the calculation for.

Best regards

RE: out of Plumbness Tank

what happened? Has the shell to bottom joint rotated, foundation locally settled, paper thin shell?
You need to provide more info. for responses to your inquiries.

RE: out of Plumbness Tank

Dude, help us out with some info!!!!
What are the tank dimensions?
Was the tank built to API-650?
Were the measurements taken before or after the hydrotest?Was the foundation originally built within the required tolerances?
How far is it out of tolerance?

Joe Tank

RE: out of Plumbness Tank

Seems like Shahim71 does not know much!!!

RE: out of Plumbness Tank


Chicopee and JoeTank

I'm sorry I was little away

The tank is 36.0 m Dia and 14 m H designd as per API 650 10th Edition ADD4

As plumbness is a regular thing to inspect during tank construction as per API 650 and has to be within 1/100 range. This tank was found out of plumbness when it was at the last ring erecton. 40 mm more than the allowable towards the tank center.

Foundation is ring wall beam. No problem with tank bottom to shell or foundation.

Tank is still not hydrotested.

Thanks for your cooperation

RE: out of Plumbness Tank

Is the tank roof welded?

RE: out of Plumbness Tank

also where are in relation to each other the two out of plumbness sections?  any manholes by those sections? any unusual features? how many courses in that tank? any detail may help.

RE: out of Plumbness Tank


Thanks Chicopee

Yes tank roof is welded. The two locations are opposite to each others

The tank is 7 courses each is 2.0 m

Client is ready to accept the deviation provided the design calculations are not affected. Is there any calculation need to be verified due to this non conformity

Thanks again for the help

RE: out of Plumbness Tank

If the tank is completed and the out-of-plumb exceeds the API limit, then the situation may be accepted based upon agreement of the parties.  The out-of-plumbness does not affect the design calculations.  The only adverse effect would be performance of a floating roof, if installed at a later time.

Joe Tank

RE: out of Plumbness Tank

so is the out of plumbness parallel to each other or would they intersect each other if you extended imaginary lines? also is the top course only out of plumbness or is it the entire length of the wall?

RE: out of Plumbness Tank



Thaks alot

This realy answers my question

A star for you


Thanks alot

Best Regards


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